Hearing aid



FIG. 1 is a perspective view of a hearing aid embodying the design;

FIG. 2 is a front view of the hearing aid shown in FIG. 1;

FIG. 3 is a rear view of the hearing aid shown in FIG. 1;

FIG. 4 is a top view of the hearing aid shown in FIG. 1;

FIG. 5 is a bottom view of the hearing aid shown in FIG. 1;

FIG. 6 is a left side elevational view of the hearing aid shown in FIG. 1; and,

FIG. 7 is a right side elevational view of the hearing aid shown in FIG. 1.

The broken lines immediately adjacent the shaded areas represent the bounds of the claim, and all other broken lines represent unclaimed portions of the hearing aid. None of the broken lines form a part of the claimed design. 

CLAIM The ornamental design for a hearing aid, as shown and described. 